Designing an iPad or Android Tablet app, and wondering if you’re asking users to download “too much” data while using it?
We know that “unlimited” data packages often run a 1GB / month soft-cap, or 3GB / month if you’ve got a long-running contract – but how much of that do people actually use?
Are they running at the limit, or do they have hundreds of meg to spare?
One morning last week, I fired up Xcode4, and all projects were refusing to build. The Apple Developer certificate had expired (why does Apple make this expire *earlier* than your annual iOS $99 subscription? Odd).
Anyway, a quick trip the Apple Developer Portal, and the Provisioning page, one-click “renew” certificate (free), 30 seconds refreshing for Apple to process it, re-download, delete the old one (using the Apple app: Keychain Access), install the new one, re-build.
…only to be hit by this error message:
“CodeSign error: Certificate identity ‘iPhone Developer: XXX (YYY)’ appears more than once in the keychain. The codesign tool requires there only be one.”
What?
I just deleted that, in Keychain Access. I selected the one that was expired (it’s highlighted with a red error icon), and hit delete. It then disappeared. And allowed me to install a new one.
Xcode4: Clean, re-build. Nope, still refusing
Xcode4: restart, delete all build directories. Nope, still refusing.
It’s a bug – a HUGE bug – in Keychain Access (Apple’s app that is part of OS X).
When you hit “Delete” (either the delete key, or right-click and select the Delete menu item) … Apple 50% of the time doesn’t process the deletion.
However, 100% of the time, Apple makes the item disappear from the screen.
To check if it’s deleted, close Keychain Access and re-open. If the delete was ignored, then you’ll see that the certificate you deleted has RE-APPEARED:
(third-from-the-bottom, you see the cert I had already deleted … has come back from the dead)
I’ve found that if you switch to the “All Items” view, on the left hand side, the deletion seems to work every time. But maybe that was just blind luck. Even if it fails, the act of switching back and forth between “All Items” and “My Certificates” seems to force KA to refresh the view, and tells you if the delete has “worked” yet:
